Drop support for 32-bit x86 prebuilt binaries

SIMDe 0.8.2 doesnt build on 32 bit and while that will likely be fixed
eventually, 32bit isn't tested in CI and generally speaking there isn't
much use for this platform anymore. I dont know of any 32-bit computers
in common use these days.

As such the overhead of maintaining these is not worth it for me.
kitty itself remains buildable on 32-bit though no guarantees for how
long that will last. kitten remains available on 32bit.

docs/installer.sh

@@ -49,9 +49,7 @@ detect_os() {
                 amd64|x86_64) arch="x86_64";;
                 aarch64*) arch="arm64";;
                 armv8*) arch="arm64";;
-                i386) arch="i686";;
-                i686) arch="i686";;
-                *) die "Unknown CPU architecture $(command uname -m)";;
+                *) die "kitty binaries not available for architecture $(command uname -m)";;
             esac
             ;;
         *) die "kitty binaries are not available for $(command uname)"

publish.py

@@ -84,7 +84,7 @@ def run_build(args: Any) -> None:
             time.sleep(25)
             call(cmd, echo=True)
 
-    for x in ('64', '32', 'arm64'):
+    for x in ('64', 'arm64'):
         prefix = f'python ../bypy linux --arch {x} '
         run_with_retry(prefix + f'program --non-interactive --extra-program-data "{vcs_rev}"')
         call(prefix + 'shutdown', echo=True)

setup.py

@@ -2022,7 +2022,7 @@ def build_dep() -> None:
     p.add_argument(
         '--platform',
         default=Options.platform,
-        choices='all macos linux linux-32 linux-arm64 linux-64'.split(),
+        choices='all macos linux linux-arm64 linux-64'.split(),
         help='Platforms to build the dep for'
     )
     p.add_argument(
@@ -2034,7 +2034,6 @@ def build_dep() -> None:
     args = p.parse_args(sys.argv[2:], namespace=Options())
     linux_platforms = [
         ['linux', '--arch=64'],
-        ['linux', '--arch=32'],
         ['linux', '--arch=arm64'],
     ]
     if args.platform == 'all':